Parashas Eikev · Passuk 11:19
and teach them to your children—reciting them when you stay at home and when you are away, when you lie down and when you get up;
Torah Temimah points to Kiddushin 29b. (שם שם — same source as the previous unit).
TT lemma: ולמדתם (unit 3 of 10).
English: It was taught: A woman is not obligated to teach her son Torah, for it is written “you shall teach / you shall learn”: whoever is commanded to learn is commanded to teach; whoever is not commanded to learn is not commanded to teach.
Derash on the verse (Bavli sugya) — not a formal named middah of the 13
The Gemara uses this passuk in a sugya (proof, illustration, or dispute). Named as one of R' Yishmael’s 13 or R' Eliezer’s 32 only when that move is explicit.
The duty to teach one’s son is tied to one’s own duty to learn; the sugya applies that linkage to the mother’s role.